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 Hum and Micro-phonics Noise

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MichaelS
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Join date : 2015-06-02

PostSubject: Hum and Micro-phonics Noise   August 21st 2015, 9:47 pm

Hello again, friends!

I have finished (I think) my restoration of my 1923 Freed-Eisemann, NR-5, five tube battery set.

When I fire it up with the ARBE III, I find that I have a real problem with micro-phonics in the tubes.  I can thump one and they ring like a bell.  Also crackling sounds like a rock-tumbler.  The other night I was able to pick up one station, but did not hear a call sign, but by the sound of the announcer, he sounded like he was from "up Nawth."

I was happy to get that one station, however the symptoms seem to be getting worse.  I do not have a tube checker or access to one.  Before I shell out the $$$ for a re-tube, I'd like to get you guys input on the matter.  BTW, I do not have a loudspeaker, so I have to use headphones (Trimms) (they have been checked and the connections were tightened up which I found were loose)

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"Filamentary, my Dear Holmes, Filamentary."
"I often talk to myself; No one else will listen, and I am the smartest person I know"
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FrankB
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Join date : 2010-11-22

PostSubject: Re: Hum and Micro-phonics Noise   August 22nd 2015, 7:00 pm

Tap gently on the tubes with a pencil eraser, no harder than you want to get hit on the nose with.
 The microphonic tube will make noise.
 You can also have bad socket or solder connections causing the problem, or even a ground.
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MichaelS
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PostSubject: Re: Hum and Micro-phonics Noise   August 23rd 2015, 1:03 am

I have sorted out the problems !  Was worried for nothing.  As soon as I hooked the radio up to a good earth ground and my outside antenna, It came alive!  Too many stations to list, however, I think part of the AM dial frequencies are missing.  I could not pick up anything much above 1050 kilohertz, but I did pick up some Atomic Clock.  There was no recorded voice at the minute tone, just morse code.
 Basically I still have a sensitive tube, and I need to make up some good connection wires with spade lugs on the ends.  I have it hooked up to my ARBE with gator wires and they are a Pain in the bum and always seep to pop off (plus the screws that hold the wires to the proper taps on the ARBE get loose very easy.
Thanks to all for their imput.  Now I can do my happy dance!

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"I often talk to myself; No one else will listen, and I am the smartest person I know"
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